add comment for bpf filter

[libpcap] / pcap-dpdk.c

diff --git a/pcap-dpdk.c b/pcap-dpdk.c
index eb9c0b3d852effc3ddb5fb3a0200bc08bbd1edd5..ebd8c283d17e3619703a1f11c74770b963dbac82 100644 (file)
--- a/pcap-dpdk.c
+++ b/pcap-dpdk.c
@@ -672,8 +672,8 @@ static int pcap_dpdk_activate(pcap_t *p)
                p->selectable_fd = p->fd;
                p->read_op = pcap_dpdk_dispatch;
                p->inject_op = pcap_dpdk_inject;
-               // DPDK only support filter in userland now
                pd->filter_in_userland = 1;
+               // using pcap_filter currently, though DPDK provides their own BPF function. Because DPDK BPF needs load a ELF file as a filter.
                p->setfilter_op = install_bpf_program;
                p->setdirection_op = NULL;
                p->set_datalink_op = NULL;
@@ -751,8 +751,10 @@ int pcap_dpdk_findalldevs(pcap_if_list_t *devlistp, char *ebuf)
                        // PCI addr
                        rte_eth_dev_get_name_by_port(i,pci_addr);
                        pcap_snprintf(dpdk_desc,DPDK_DEV_DESC_MAX-1,"%s %s, MAC:%s, PCI:%s", DPDK_DESC, dpdk_name, mac_addr, pci_addr);
-                       // continue add all dev, even error happens
-                       add_dev(devlistp, dpdk_name, 0, dpdk_desc, ebuf);
+                       if (add_dev(devlistp, dpdk_name, 0, dpdk_desc, ebuf)==NULL){
+                               ret = PCAP_ERROR;
+                               break;
+                       }
                }       
        }while(0);      
        return ret;